Fan guard



G. C. KEMLER Nov. 11, 1952 FAN GUARD Filed Aug. 19, 1949 IN V EN T 0R.

(em/er I HA 6/2/71? 6 i 5 w 4 Afro/WE! Patented Nov. 11, 1952 FAN GUARDGlenn C. K-einler, Albion, Mich assignor to Union Steel ProductsCompany, Albion, Mich.

Application August 19, 1949, Serial No. 111,298

7 Claims. (01. 230-'-275') This invention relates to improvements in fanguards.

The main objects of this invention are:

First, to provide a fan guard which may be formed of wire stock and atthe same time is strong and rigid.

Second, to provide a fan guard comprising a base portion adapted formounting on a fan motor casing or the like and an outer guard or gridsection which is detachably engageable with the base section tofacilitate the mounting thereof and affording access to the fan.

Objects relating to details and economies of the invention will appearfrom the description to follow. The invention is pointed out in theclaims.

A preferred embodiment of the invention'is illustrated in theaccompanying drawings, in

which: Y

Fig. 1 is a front .elevational view of a fan guard embodying myinvention, a fan being conventionally illustrated by dotted lines.

Fig. 2 is an enlarged view in section on a line corresponding to line2-2 of Fig. 1.

Fig. 3 is a fragmentary disassembled view showin structural details ofthe guard base member and the outer or grid member.

Fig. 4 is an enlarged fragmentary view partially in section on line 4-'4of Fig. 2.

Fig. 5 is an enlarged fragmentary view partially in section on line 5-5of Figs. 2 and 3.

Fig. 6 is a side elevational view with the members of the guard innested relation for packaging. or shipping.

Fig. 7 is an enlarged fragmentary view par tially in section on line I-1 of Fig. 6.

In the accompanying drawing I rep-resents the fan base and pedestal, 2the motor housing, 3 the fan blades. These parts are shown in dottedlines and conventionally as they form no part of my present invention,but are illustrated to indicate an application of my invention. 7

The base member of my fan guard designated generally by the numeral 4comprises crossed parallel support bars 5, 5 and 6, 6 welded together attheir crossing points as indicated at 1. These supporting bars 5 and 6have forwardly projecting arms 8 and 9 respectively to which the rimmember [0 is welded as indicated-at 2|. The arms 8 are extended toprovide lugs l I, the purpose of which will appear later. 7 r

The outer guard or grid member designated" generally by the numeral i2comprises spaced parallel grid bars l3 and I4 disposed in crossedrelation and welded together at their crossing points as indicated atIS. The grid member [2 is provided with inner and outer rim members I6and I1 disposed in concentric relation on the opposite sides of therearwardly projecting arms ill of the grid bars. These rim members l6and I! are spaced to receive the lugs of the base member as shown inFig. 4 when the parts are assembled and in Fig. 7 when the parts arenested as shown in Fig. 6.

The lugs II have recesses l9 receiving the rim members i6 and I! forsecuring the guard or grid member upon the base. The rim membersspringably engage the lugs H.

In commercial practice the structure is so formed that it requiresconsiderable force to assemble the guard member upon the base member asit is important that it shall not be accidentally disengaged and also toavoid all rattling. The parts may be easily disassembled by inserting ascrewdriver between the rim members of the guard and the base and pryingthe lugs out of engagement with the members l6 and IT. The lugs can beeasily engaged by the rim members by a pair of pliers.

The base bars 6 are provided with offsets 20 which constitute eyesadapted to receive attaching screws for mounting the guard upon thehousing of the fan.

This arrangement of parts enables rapid fabri cation of the guard fromrelatively light wire stock; at the same time the structure is strongand rigid and can be readily assembled on the fan. To accomplish thisthe fan blades are removed from the shaft and the base member of theguard mounted thereon by means of screws engaging the eyes 20; the fanblades are then replaced and the front guard member or grid is mountedon the base portion. This may be accomplished without the aid of screwsor bolts other than such as used to mount the'base member on the fanhousing. The guard does not vibrate or chatter and the parts may be verycompactly nested for shipment or. storage. In the, nested positionillustratedin Figs. 6 and 7 the lugs H are shown engaged by the rimmembers 16 and l? but quite compact nesting may be had without suchengagement.

I have illustrated and'described a highlypractical embodiment f myinvention. I have not attempted to illustrate or describe otherembodiments or adaptations which I contemplate as it is believed thatthis disclosure will enable those skilled in the art to embody or adaptmy invention as may be desired.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

1. In a fan guard, the combination of a base member comprising spacedparallel supporting bars disposed in crossed relation and fixedlysecured together at their crossing points and having arms at their outerends turned laterally and projecting from the general plane of saidbars, an annular rim member fixedly secured on the outer sides or saidarms with the arms of a plurality of the bars projecting beyond theopposite side of the rim from the support bars and constituting lugs,the lugs being recessed on opposite sides thereof, an outer guard membercomprising crossed parallel grid bars fixedly secured together at theircrossing points and having arms at their ends turned laterally andprojecting from the general plane of said grid bars, and annular rimmembers fixedly secured in radially spaced concentric relation onopposite sides of said arms on said grid bars and adapted to springablyreceive the said lugs of said base member between them and engage in therecesses of said lugs whereby the outer member is removably mounted onthe base member.

2. In a fan guard, the combination of a base member comprising spacedparallel supporting bars disposed in crossed relation and fixedlysecured together at their crossing points and having arms at their outerends turned laterally and projecting from the general plane of saidbars, an annular rim member fixedly secured to said arms with the armsof a plurality of the bars projecting beyond the opposite side of therim from the support bars and constituting lugs, an outer guard membercomprising crossed parallel grid bars fixedly secured together at theircrossing points and having arms at their ends turned laterally andprojecting from the general plane of said grid bars, and annular rimmembers fixedly secured in radially spaced concentric relation onopposite sides of said arms on said grid bars and adapted to springablyreceive the said lugs of said base member between them whereby the outermember is removably mounted on the base member.

3. In a fan guard, the combination of a base member comprising spacedparallel supporting bars disposed in crossed relation and fixedlysecured together at their crossing points and having arms at their outerends turned laterally and projecting from the general plane of saidbars, an outer guard member comprising grid bars disposed in crossedrelation and secured together at their crossing points and having armsadjacent their ends turned laterally and projecting from the generalplane of said grid bars, and annular rim members secured in radiallyspaced concentric relation on said arms of said outer guard member andadapted to springably receive at least certain of the arms of said basemember between them for detachably securing the outer guard member tothe base member when the members are assembled in facing erectedrelation.

4. In a fan guard, the combination of a *base member comprisingsupporting bars having arms at their outer ends turned laterally andprojecting from the general plane of said bars, an annular rim memberfixedly secured on the outer sides of said arms with at least some ofthe arms projecting beyond the opposite side of the rim member from thesupporting bars, an outer guard member comprising grid bars having armsat their outer ends turned laterally and projecting from the generalplane of said grid bars, and annular rim members fixedly secured inradially spaced concentric relation on opposite sides of said arms onsaid grid bars and adapted to springably receive the projecting arms ofthe base members between them for removably supporting the outer guardmember upon the base member.

5. In a fan guard, the combination of a base guard member comprisingsupporting bars provided with arms at their outer ends turned laterallyand projecting from the general plane of said bars, and a grid guardmember comprising grid bars provided with arms on their ends turnedlaterally from the general plane of the grid bars, one of said guardmembers being provided with concentrically spaced rim members attachedto the arms thereof and the other guard member having notched lugextensions on certain of its arms engageable between said concentric rimmembers for securing the members in assembled relation.

6. In a fan guard, the combination of a base guard member comprisingsupporting bars disposed in crossed relation and fixedly'securedtogether at their crossing points and having arms at their outer endsturned laterally and projecting from the general plane of said bars, anouter guard member comprising grid bars disposed in crossed relation andsecured together at their crossing points and having arms at their outerends turned laterally and projecting from the general plane of said gridbars, and an annular rim member secured to the sides of the arm of oneof said members with certain of the arms projecting beyond the rimmember, the other guard member having concentrically disposed and spacedrim members secured to its arms and adapted to receive the projectingarms of the other guard member for detachably connecting the members inerected position.

'7. In a fan guard, a base guard member comprising grid bars, and anouter complementary guard member comprising spaced grid bars, one ofsaid guard members having annular spaced concentric rim elements securedto the ends of at least part of its bars, and the other guard memberhaving lug-like elements formed on the ends of at least part of its barsturned laterally of the bars to be engageable between said rim membersfor detachably connecting said guard members to each other, the endportions of the bars of at least one of said members being ofisetlaterally from the intermediate portions of the said bars whereby theintermediate portions of the guard members may be spaced from each otherwhen said elements are engaged.

GLENN C. KEMLER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date D. 152,758 Ullman Feb. 15, 19491,577,280 Xippas Mar. 16, 1926 1,871,625 Luff Aug. 16, 1932 2,259,853Koch Oct. 21, 1941 2,487,294 Belter Nov. 8, 1949 2,498,968 Viewegh Feb.28, 1950

